What are the common additives used in ink classification?
Ink additives are used to adjust the ink to adapt to different printing conditions of auxiliary materials. There are many types of ink additives, generally used to remove the sticky agent, light agent, drying agent, slow drying agent, thinner, friction-resistant agent, varnish, etc. In addition to the above several commonly used ink additives, there are anti-scuffing agent, anti-bubble agent, printing gold oil, etc.. From the perspective of improving the efficiency and quality of printing, according to the changing printing conditions, in the ink selected to add some additives, to ensure that the normal printing is beneficial.
Withdrawal adhesives: Withdrawal adhesives have a very small viscosity, generally used in lithographic and letterpress printing ink to reduce its viscosity. In offset printing, due to changes in paper properties and printing conditions, such as oil absorption, poor surface strength, front and back of the coating has fallen off, when the desiccant is too much or printing shop room temperature is too low, will cause paper hair pulling, printing pile plate, paste plate and other failures, affecting the quality of the print. Therefore, when the above phenomenon, you can add the right amount of withdrawal of adhesives, it can play a role in weakening, eliminating the above failures.
Withdrawal of light agent: withdrawal of light agent is also known as a washout agent, is a relatively large amount of offset printing additives. There are two kinds of common evacuating agents: one is transparent oil, used for glossy ink; one is resin-based evacuating agent, used for resin ink. If you find that the ink color is too dark in printing can not restore the original, you can add the right amount of light agent to make it achieve the desired effect.
Desiccant: desiccant is one of the very important printing ink additives. According to the different printing conditions and printing paper, the dosage, type and usage of desiccant are also different. The commonly used desiccants are red drying oil and white drying oil, and the drying of red drying oil is from outside to inside, while white drying oil is dried at the same time with outside. When printing, I choose the type of drying oil in accordance with the requirements of drying the print and ink color. Generally the amount of drying oil is 2%-3%, too much will be counterproductive and make the drying speed decrease.
Slow drying agent: anti-drying agent is also called antioxidant, which is the opposite of the drying agent of an ink additive. In the printing process, due to various reasons often cause downtime, when the downtime is longer, the ink on the dry skin. In order to, solve such problems, often to the machine ink to add the right amount of anti-drying agent, and run the machine a few times, so that it does not dry too fast.
Diluent: in printing because of excessive ink viscosity or poor paper quality, etc., often produce paper hair pulling, plate failure, affecting the normal printing, at this time, in addition to adding the appropriate amount of withdrawal of viscous agent to reduce the viscosity of the ink, you can also add a small amount of diluent to reduce the viscosity of the ink outside, so that printing goes smoothly. Diluent of more types, generally low viscosity of the six ink transfer oil.
Friction-resistant agent: friction-resistant agent is also known as a smooth agent, most of these substances to wax-based substances, in the printing ink particles coarse, such as white ink, gold and silver ink, add the right amount of friction-resistant agent to increase the friction resistance and smoothness of the printed material.
Varnish: trademarks, albums and other high-grade prints, most of the print surface to be varnished to achieve a high gloss effect, the use of varnish, can be mixed in the ink before printing, can also be printed in the print after the addition of a varnish. But by the varnish treatment of the print, long after the yellowing, poor light resistance, therefore, there are now many alternatives to the varnish of the new varnish has been applied.